FILE - In this Feb. 25, 2021, file photo, vials for the Moderna and Pfizer COVID-19 vaccines are displayed on a tray at a clinic set up by the New Hampshire National Guard in the parking lot of Exeter, N.H., High School. The nation is poised to get a third vaccine against COVID-19, but health officials are concerned that at first glance the Johnson & Johnson shot may not be seen as equal to other options from Pfizer and Moderna. (AP Photo/Charles Krupa, File)

The audience wearing protective face masks watches on opening night at the Khan Theater during a performance where all guests were required to show proof of receiving a COVID-19 vaccination or full recovery from the virus, in Jerusalem, Tuesday, Feb. 23, 2021. (AP Photo/Maya Alleruzzo)

The audience waits on opening night at the Khan Theater during a performance where all guests were required to show proof of receiving a COVID-19 vaccination or full recovery from the virus, in Jerusalem, Tuesday, Feb. 23, 2021. (AP Photo/Maya Alleruzzo)

A man presents his "green passport," proof that he is vaccinated against the coronavirus, on opening night at the Khan Theater for a performance where all guests were required to show proof of vaccination or full recovery from the virus, in Jerusalem, Tuesday, Feb. 23, 2021. (AP Photo/Maya Alleruzzo)

FILE - In this Feb. 19, 2021, file photo President Joe Biden speaks after a tour of a Pfizer manufacturing site in Portage, Mich. (AP Photo/Evan Vucci, File)